Firefox: Invisible Hand is an apt name for a deal-finding Firefox add-on. Visit a priced item page…
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Since Chrome (and Internet Explorer) do not "sandbox" background HTTP requests from installed extensions, or separate them from other tabs, the extension's efforts to find deals and discounts will be recorded as separate searches on Amazon and other sites, even though you never actually made those searches yourself. This may be fine for some users; in fact, it could be helpful when you're shopping—but not for more privacy conscious users, or those that don't want certain Google searches influencing their "recommended for you" list on Amazon's homepage. While searches are leaked to all stores, Amazon is the only site to use them so prominently.

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The solution? There's always incognito mode, with Invisible Hand and similar extensions disabled, although that isn't necessarily practical if you want to protect all your Google searches, since you'd have to have it running pretty much all the time. You could also use Firefox instead of Chrome, which, due to HTTP sandboxing, does not have this problem with the Invisible Hand extension. There's also a preference within the extension to turn it off for Google searches, which will stop the leak through Google, though searches on other stores such as, say, BestBuy.com will still leak to Amazon. Probably your best option is to disable the extension altogether, and re-enable it only when you're in a session dedicated to online shopping, since Chrome extensions are super easy to turn on and off. Chrome won't even require a restart if you enable and disable an extension in such a manner.

UPDATE: The makers of InvisibleHand have corrected a few mistakes in my understanding of the leak. InvisibleHand does not send a query to Amazon unless it thinks you are searching for a product. So if you search, for example, "hotels in new york" on Google, that will likely not be leaked to Amazon and will not influence your recently viewed or recommendations. You may still want to take a precaution against this happening when you do search for certain products on Google, but just know that it does not apply to every Google search you make. Sorry for the misinformation.

Hit the link for more detailed information about the leak and why the behavior isn't likely to change soon.